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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '252e71846b60f67da8ea11922a467c2a0d64ada8b42d21887040116492e5c5d2' 
  AND token = 'WcRHg0J9ZjJ4nMkGkfbHhmK4rfLk12O/NXfz4aCuwgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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