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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf98f88daea523be4792ada4614feea152634b3604215e9e4e24bbcc73a922b2' 
  AND token = 'NQwlnq6xTaE1EKNYInGzGg68FMOtkmq+YObGUkv828M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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