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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99908c991c35247685c7a22cf10acb659b8bf58ba67178bba2313751039a1960' 
  AND token = 'DIeh7FXYuKvd9d/tifxDe6dQTsg2Nb25EG4IG61GsdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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