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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa317eeae9a2bf58a3c39bbcea67f3820b40919796ab1c95b8debde1c49ca95' 
  AND token = 'ENjarryKWsmQT+ogv9CXR0fftOt6qLlEb9ZY1XhFJEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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