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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb63093af17cd87b773050e2dafadff2658a0a921f9d8ee2a8d8aed43a087fd7' 
  AND token = 'FDrI0GqxuFT5rogwSME79XJnbvk68qONWBWNqSu0+N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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