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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d61f806ed17113596360676b019c5d6ab99e4664073f7b60af4ce7de905dfa' 
  AND token = 'yXKYjlD9qXNxzpGKd0V2fh4VDyeVG8W6GWHJlUnW+hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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