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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70321cf27768f3df7b3359289d12f31e028e40d477ceeebe02fdfe03dc27baa' 
  AND token = 'AmBpNG99E8cOJj/y1qvyRdqvNyi9+HhXFAspcdiS/y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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