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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a982a696c34240df86a7741fc3eade03b9274ed3c4b6d8edce910d7d8e0f7319' 
  AND token = 'qv7m+Xo+518WX6PZgOkwQi54qJZM+FRdedOoXwra0uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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