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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a68d14a4a7566ba3aa080b63e340aeb196e54d2fe8334ed9fcef634e1e81bb' 
  AND token = 'rY9TQAV8T/NU94Q08fkM7EajmZztUja5zGXiZmS2dXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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