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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c67130cff8461609f5502beb1fd2046b95f8c2184a252abcd4fa59c59030bd5' 
  AND token = 'U9Rx1MbNCwbEIEs/btS8ad5wcqx3fs0BPaUm0x9Evuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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