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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128153799734e98ffdb3b9b2ca82effcb6ab22b7d8fdc5b9563f63a00dec0ca2' 
  AND token = 'KyZjAaaj+tylPAUdB/shCxDME2+rRpqaFbkzkbHU5lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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