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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c06dbf25a6cf8634bb4b94826d8c3ae6be28ccd0d51517f0decfb043643fe0' 
  AND token = '7ow7CYnq6+Y/Vvwi33nPolH67awQZWiD2TkbTq3UQsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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