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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70a3eb4e07bc99fc481c478eac70342473c3444a64b6a7aa82a05a2f9bf32df' 
  AND token = 'SDgKAgHTeq7BpoAPqLLMT0UEMHy0G9N67tiMhTSA/Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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