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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c891d4fb1f78e0e433486ca356c2290950d910dc2f938a36d37d6c2cc605008c' 
  AND token = 'dtnwH970fCUiYwhLJl5W4sO4LuzJp+ecZLKPrh+7+ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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