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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700aeeb393383abeda953401f3f39e60a4e4a7d79b4c27c2e4388f2e8b2367d6' 
  AND token = 'Af8VbZXQfY3dALgcDq4mHzjLZ16NLZAIiw9KFmwJrkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}