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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e11be607bf175025ac2ee0f3d4050853f586ac8e08149d14b911e428f4da7fc' 
  AND token = 'qsFfypNX/o9WOypxVdxnJufBpS3Hx0sBUIzieiGdV00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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