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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c2c24d8fea1fc994990f189e23699b65ccb000f8d9852a24556ecb826343d6' 
  AND token = '9TKTo3krox6rQo1CCGu2Gsw4r+nEtSV2VjXXkX/b8us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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