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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e912768c59d2f7e994861e19781b99c14e06408b1b439bd29a9e96483224dbef' 
  AND token = 'imnDYEHG6V21vux/3GZ/nyqZQF7y2p/ihvp/BxWD7g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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