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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18285ea7599cae0722e94dfb2b3441d49534e0e4b6e6a454fa2311598c7e5e3' 
  AND token = 'lCAt8v0LmiBQLU49Ulz2ws61xYTb/HJ7jddl6Ia9Bak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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