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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4de67491f9e594e4315759b0a8bf9320ec643bafab4e6bfa1b320d6f65d3cab' 
  AND token = 'XhIc8ioe3npa+c/w5YGin5N3mn8bydg3BLxWd4o5P+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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