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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '305e1050a3aa7b5d9dc9c13ceb439dfdadaf31c4c012e04416ada4d55d57b74e' 
  AND token = 'x+cq5+vFi/qYvQvdpjmGsABHtBOpXh6vrpEJtWN4JeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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