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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '290302951e3f489a59385d4eecf0ba37ae93f95e17a9908e57a9ff74165b40f0' 
  AND token = 'NBMjL6u9Hvzx3AHWe37F9j4AfrCrW0G2QSx8xzYmdas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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