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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc4dda681319a791ab58f9e98da95877ab5a78c9e00ba95e9e8923ccc850ee04' 
  AND token = 'AP0SaLDUpdg9d2FuKbCIkCaMs0Vr0xnw1C9r8gjgbis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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