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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f9273aa6ea55d86cf4019a9e7820ecdb0bf84c189d444f577c20beb1c5e1bd' 
  AND token = '5ZT+8HNLINblBbDTh8w8adToZv0421x5ffktAkMN3+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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