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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '452f162a4893b7eb7c4816586870e9fc65b1a4e1f4db09d0c4f063c2b116435f' 
  AND token = 'ZYPRPktf6vI3HQRyHnPU8TudLntl2RDheVLnGD6X1To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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