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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '659c73ae0f79f5c8e69bb07c3a853e64285ce425f1e21642cb13f8c13cda42f8' 
  AND token = 'EeUagxB8dVl6W3PxKOGOizgH2tqatufHRJc+c2uLMb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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