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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca8f7d171d105cbcecf921eeda23d8cea17f0f35ce5d34f681ea220a1678cd6' 
  AND token = 'bDvD7JQfjQJnmDq5OK90ZhcmJfnG3Xkns9SQ+j1lhxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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