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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd636ac0c17a920ec775401ffdcdb3cdfa9009134deecda90f6ad81df25dbf832' 
  AND token = 'Ps9KegEfaec8BmhTbyQvtt1BC5Q1iUdtYGPL2zGx45E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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