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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68b98e657cf298409b0cbaa8850ce314fcb307e0e06fc2fd0024ce4e74d4882b' 
  AND token = 'Go8mE6/GK/y3L0sGJj9D2eBS4jUa/z82HvWoIA0XGeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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