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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3866dc5a33594b49dd3ce37e937ebe95b75d24b8667566296d02d1375bb97b6' 
  AND token = 'sEYrjwzFXpMWQveSlfvxUx3ywp5l/IHSb7LQt63Ju6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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