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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b68560a5545d110733494cd6efe164a821f80828a80de8c2d1276a93c7881e' 
  AND token = 'sEMlfCl0OKXSD4ODT7kc+tMoH8duLxwfXlXJGrgkoaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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