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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4005035eb60d5cf6dec56f30861ae162e089ff2526ca58c45cdeaecd342cba1c' 
  AND token = 'LDjOn197B1FflPVJXGpXmsw90GuDGOjE4f3tilfr2tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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