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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca13aadd3ca433601c8b88658cba892dd85c7b17c23a7ab37fa345d6a5d0151' 
  AND token = '5pIO3RmY8fZ2Ua9+qQxm5nfG9s2gI2ywgOZiY/s2Xx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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