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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6bb2b72387622ea14369394620b1a9d6d8c7f55f1bb9b79cd140aa50d4af7c' 
  AND token = 'zH8eBuKKerAFLeGz7wo3Y4cbsbo83/v5NY0l8kXuRXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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