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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aadeed768ca03f54b806311f77e1a4fc6a0f409f9271740c7b94962a9a319cb6' 
  AND token = 'NOQHTv/teTxX/R45qrg6OMTUAethILhnpktFr7NhQDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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