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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc264b4bbd40ed3ce177d2bd765faff847d778e70857f394bf61721f91397bc2' 
  AND token = '6rHVr0Lg4y0+SkcUBQhsB6Zokcp9TIXwJvK7Hw/rQ0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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