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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c274e66a4327183c815c69317f7d7b1a707725cdbcbf4a9aa3b2cb9c54bd45' 
  AND token = 'gAmBWgqH8IVPhc2epMbjXou7U21LXzl1Qfdxxjqs70A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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