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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29bacd7be2f90719352a93c9a16eb032a0327a5f4a5064c49f25ee38b737952f' 
  AND token = 'WNv/hvXG52Ev8jstv/vbO2fiXC8wYqCvHfUM+V7ZPIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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