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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96dd29b332daaf2177b578aca195c4f2b5e48bd6aa49c4daf29564de6db1cfa5' 
  AND token = 'ODHr7xhwRtSwIU4iMxIrVXuZx9+aIlhbFw7SU0pomd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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