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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '565c9caab3903c6f331bd00c0932b37b285f4001248d715115b6e3143ff2ddf9' 
  AND token = '+N3i35caNSwbrePGvA2hwY3xXOWmU5W4orodkcxBMp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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