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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc3dc44295145baaee930e23585a3604e070e067705dc9da0e5c117718fb124' 
  AND token = 'OwETpWNsHeX+BLA8ThdKZfaiKs5s4YeKZG6Ss+YFAmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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