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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ee78f278f14a53a19a16862dc05f9dc6845748c25dac2a8c6408569b2c26f7' 
  AND token = '2mzkavygn8Voh8ncqjzphMNRlIQH1SHeCO5NUl+W2UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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