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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e03ffbd2a8fab57e930fc5d24504266ce8bf9cae2ef99d375aa1140e9e3a5fb' 
  AND token = 'NB9qdbeTmusuRcF4qy9UMGe/HWLKpIW27TZUQ0CJIxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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