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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6866f6cdf2fa70dbbd48cd678062364018724c02e713a3af2468efe4dc66ba5' 
  AND token = 'PKNzoa+2Q5iY+iOpWJhqj39wawxbOXljLOxjGOWRnMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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