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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '263690b28c850237f46ac2c2298836c671ad366b0101460cd10ae4827bc8e42d' 
  AND token = 'GiaNZrymarTGSoS0vvdbNt/bh20RZSeW+/K9KL6jmYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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