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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0efb393fa294a87854464516c8e6cc294efab15e27b241ef64ea708d93a5d2b0' 
  AND token = 'f5KltG+w3qXOKt594ZcaXTofVdH8yd2IIz/VeKOe+KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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