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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4db6d729439b52b895dff0bb3aa3e07c9a66af4540efdc5096143dfe600ed45' 
  AND token = 'jS6Q6t/Xpthc+24HRxguHkQRX66V7V+2TJOAP+8YvEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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