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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b55d4bb48df63f46d813ce5b466385a9f942a3088cb322b38abb0389291b0a' 
  AND token = '1rWOXyFrPKFA5q9JBkKcUwEChai0RWwK4cooIMZc21c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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