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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369c6bbbac2f3a236ef517aa91c90ff27e3d9bad36a0c3239085013b7a352111' 
  AND token = 'Q7lofOuue4n4EODvVo0NnlfN/6M/EckeP6J6ukFkdZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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