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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91673ccc611d24d462e4d00671dcf90d160587f2ab584a29277de572e8dad6d5' 
  AND token = 'MTxm+VPR3UB8D7k3yaxgqmjEzXsaPTjvAzRTy/gugl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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