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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2a67e2917ceb628b4f3fdd026c6c8a41d021046c0859e28a661514968b1b5b' 
  AND token = 'VNarrqLt7apiZSbdKuf3JOGc5KoQcGmKLiCFgJJyn+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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