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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12fdabf612388d6f6af1cef4ef64ab36c6e01d1367f91e4b9d2a62e93a8e931b' 
  AND token = 'XU3D6Mol2/a+4Y/JFUc9FeU53Kt+CoJMPmdaJPGt3cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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