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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989d3150b2716b730fc6fc2dd12e405e5ac7faccb0b374f3bd868237fc0f063e' 
  AND token = 'jlQipqf4Xwz+6sX9jksNQ93x83b3ZXHmf4oOfS0Mepw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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