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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff35822175e590c8d011fd67f9b1958dd3be3edf40d9887cb2ebb6f07091d3f9' 
  AND token = 'H4GKNMt97Etm2okQ1s25jscqE/2m+rETRhASL7jSf8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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